JP2871179B2 - Processing method of polygon scanner motor and its mirror mounting part - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polygon scanner motor for driving a polygon mirror (polyhedral mirror, also simply referred to as a mirror) used in a laser beam printer, a digital copying machine, a facsimile, or the like, and a mirror mounting portion. Related to processing method.

[0002]

2. Description of the Related Art As a conventional document of a polygon scanner motor, Japanese Unexamined Patent Publication No. Hei 3-18241 discloses a motor having a rotor inside a stator. A spindle motor for driving a magnetic disk, which has a rotor on the outside of the stator (outer rotor type), has a flat surface.
No. 105373 is known. Therefore, an outer rotor type polygon scanner motor can be easily devised.

[0003]

However, even in the case of the outer rotor type, the accuracy of the mirror mounting portion of the polygon scanner motor is extremely strict. Accuracy is not always good and defects tend to occur. Therefore, there is a method of finishing the mirror mounting portion by rotating the polygon scanner motor by itself. However, the polygon scanner motor does not properly have the characteristics of the torque and the number of rotations required for the processing, and good finishing cannot be performed. In addition, it is necessary to connect a power source with a connector every time processing is performed, which is not suitable for work. If the exposed rotor of the outer rotor type is gripped by the chuck of the lathe, the rotation centers of the chuck and the polygon scanner motor do not exactly match, and the bearing of the polygon scanner motor is damaged. The method in which the outer periphery of the rotor is driven by a pulley or a belt that gets dirty is liable to damage the bearing if a necessary processing torque is applied. On the other hand, in the high-speed operation at the 20,000 rpm level, the output of the polygon scanner motor increases in response to the windage of the polygon mirror, but the rotor exposed to the outside is cooled well, but the internal stator is cooled. Cooling is not always good.

An object of the present invention is to provide a polygon scanner motor in which bearings and the like are not damaged even when connected to a main shaft of a machine tool in an assembled state as an outer rotor type. Improve cooling.

[0005]

According to a first aspect of the present invention, there is provided a polygon scanner motor comprising: a stator which is fixed to one side of a bracket; a rotor which is disposed on the outer periphery of the stator via a gap; Bearing 7 mounted on the inner periphery of bracket 1
A shaft 5 rotatably supported by the shaft, a disk portion 31 fixed to one side of the shaft and supporting the rotor 3, a mirror mounting hub 4 mounted on the other side of the shaft 5, A mirror mounting hub mounted on the other side of the shaft, and a hole provided outside the disk portion and between the shaft and the stator, and passing through the disk portion in the axial direction. A polygon scanner motor.

According to a second aspect of the present invention, there is provided a method of processing a mirror mounting portion of a polygon scanner motor, comprising: firstly, a stator fixed to one side of a bracket; A shaft rotatably supported by a bearing mounted on the inner periphery of the bracket, a disk portion fixed to one side of the shaft and supporting the rotor, and a mirror mounting portion mounted on the other side of the shaft. Assemble a polygon scanner motor consisting of a hub and a concave portion or a convex portion provided outside the disk portion or the rotor, and then attach the polygon scanner motor to a machine tool via the bracket, and The front end of the main shaft of the machine tool is engaged with the portion, and the rotor is rotationally driven to finish the mirror mounting portion of the hub.

[0007]

According to the first aspect of the invention, the polygon scanner motor forms an outer rotor shape, and the rotor is exposed on one side. Therefore, it can be connected to the main shaft of the machine tool by the hole 10 provided in this portion. And this connection is only a torque, and does not apply an unreasonable lateral load to a shaft or a bearing. Moreover, the hole 10 can be connected to the main shaft of the machine tool as described above, and the air flowing from the hole 10 flows inside the rotor and cools the stator 2 well.

In the second aspect, engaging the tip of the main shaft of the machine tool with the concave portion or the convex portion is a general work of machining, and does not require connection of a connector such as self-rotation. Said engagement does not apply too much lateral load to the bearing, as would be gripped by a chuck or driven by a pulley or belt. Since the finishing process proceeds without giving any deformation to the shaft and the inside of the bearing, the processing accuracy of the mirror mounting portion is improved.

[0009]

FIG. 1 is a half sectional view of an embodiment, showing an outer rotor type polygon scanner motor. The rotor 3 is arranged on the outer periphery of the stator 2 fixed to one side of the bracket 1 via a gap. A disk portion 31 for supporting the rotor 3 is fixed to one side of a shaft 5 rotatably supported by a pair of bearings 7 mounted on the inner periphery of the bracket 1. On the other side of the shaft 5, a hub 4 having a polygon mirror mounting portion S (not shown) is mounted. This polygon scanner motor is a brushless DC motor in which a rotor 3 has a permanent magnet, and a printed wiring board 9 is mounted on a bracket 1. A magnetic fluid seal 8 is provided between the bearing 7 on the other side and the hub 4 to prevent the lubricant from contaminating the polygon mirror.

A hole 10 penetrating through the disk portion 31 in the axial direction
Is provided. If two holes 10 are provided symmetrically on the same radius, the balance will not be lost. When the polygon scanner motor rotates at, for example, 20,000 rpm, the air flowing from the hole 10 flows through the path indicated by the arrow AB, and cools the stator 2 well. In the manufacturing process of the polygon scanner motor, the bracket 1 is fixed to the fixed side of a machine tool such as a lathe, and a pair of projections at the tip of the main shaft of the machine tool are engaged with the holes 10.
Is rotated to finish the mirror mounting portion S of the hub 4. Since the balance is obtained after finishing, the number of revolutions is not increased so much in finishing. When only the finishing process is intended without considering cooling, torque can be transmitted as a concave portion or a convex portion provided outside the disc portion 31 or the rotor 3 instead of the hole 10.

[0011]

The polygon scanner motor according to the first aspect of the present invention has a stator fixed to one side of a bracket, a rotor arranged on the outer periphery of the stator with a gap, and attached to the inner periphery of the bracket. A shaft rotatably supported by bearings, a disk portion fixed to one side of the shaft and supporting the rotor, a mirror mounting hub mounted on the other side of the shaft, and the other side of the shaft And a hole that is provided outside the disk portion and between the shaft and the stator, and that passes through the disk portion in the axial direction. . According to such a configuration, the polygon scanner motor forms an outer rotor shape,
The rotor is exposed on one side. For this reason, the hole provided in this part can be connected to the main shaft of the machine tool, and this connection is only torque and has the effect of not imposing an excessive lateral load on the shaft or bearing. The generated air flows inside the rotor and has the effect of cooling the stator well.

A method of machining a mirror mounting portion of a polygon scanner motor according to a second aspect of the present invention is a method of assembling the polygon scanner motor according to the first aspect of the present invention, and then mounting the polygon scanner motor to a machine tool via the bracket to fit the concave or convex portion. The end of the main shaft of the machine tool is engaged, and the rotor is driven to rotate to finish the mirror mounting portion of the hub. According to such a configuration, since the connection with the main shaft is performed only by torque and does not apply an excessive lateral load to the shaft or the bearing, the bearing may be damaged such as being gripped by a chuck or driven by a pulley or a belt. Since the finishing process proceeds without giving any deformation to the shaft and the inside of the bearing, the processing accuracy of the mirror mounting portion is improved.

[Brief description of the drawings]

FIG. 1 is a half sectional view of an embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bracket 2 Stator 3 Rotor 4 Hub 5 Shaft 7 Bearing 10 Hole 31 Disk part S Mounting part

Claims (2)

(57) [Claims] 1. A stator fixed to one side of a bracket, a rotor arranged on the outer periphery of the stator via a gap, and a rotatably supported bearing by a bearing mounted on the inner periphery of the bracket. A shaft, a disk portion fixed to one side of the shaft to support the rotor, a mirror mounting hub mounted on the other side of the shaft, and outside the disk portion, and A polygonal scanner motor provided with a hole provided between the stator and the stator and penetrating the disk portion in the axial direction. 2. A stator fixed to one side of a bracket, a rotor arranged on the outer periphery of the stator via a gap, and a bearing mounted on an inner periphery of the bracket. A shaft to be supported, a disk portion fixed to one side of the shaft to support the rotor, a mirror mounting hub mounted to the other side of the shaft, and an exterior of the disk portion or the rotor. Assemble a polygon scanner motor consisting of a concave portion or a convex portion provided on the machine tool, then attach the polygon scanner motor to the machine tool via the bracket, and engage the tip of the main shaft of the machine tool with the concave portion or the convex portion. A mirror mounting portion of the polygon scanner motor, wherein the rotor is rotationally driven to finish the mirror mounting portion of the hub.